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How to set default values in Rails?
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"Correct" is a dangerous word in Ruby. There's usually more than one way to do anything. If you know you'll always want that default value for that column on that table, setting them in a DB migration file is the easiest way:
class SetDefault < ActiveRecord::Migration
def ...
When to use an assertion and when to use an exception
..., you can use them almost everywhere and I'm using this rule of thumb: the more an assertion statement looks stupid, the more valuable it is and the more information it embeds. When debugging a program that does not behave the right way, you will surely check the more obvious failure possibilities b...
dd: How to calculate optimal blocksize? [closed]
...k size of 512 bytes tends to be almost an order of magnitude slower than a more optimal alternative. When in doubt, I've found that 64K is a pretty solid modern default. Though 64K usually isn't THE optimal block size, in my experience it tends to be a lot more efficient than the default. 64K also h...
What is Java String interning?
... you should not use intern if you don't have too many duplicate values.
More on memory constraints of using intern()
On one hand, it is true that you can remove String duplicates by
internalizing them. The problem is that the internalized strings go to
the Permanent Generation, which is a...
Hiding elements in responsive layout?
...ces
Desktops (≥1200px) (Class names : .visible-lg-block, hidden-lg)
For more information : http://getbootstrap.com/css/#responsive-utilities
Below is deprecated as of v3.2.0
Extra small devices
Phones (<768px) (Class names : .visible-xs, hidden-xs)
Small devices
Tablets (≥768px) (Clas...
How to add Git's branch name to the commit message?
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Why is this the answer? It's more like let me google that for you. Answer by @shytikov should be selected
– TheRealFakeNews
Apr 22 '19 at 22:36
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Why use getters and setters/accessors?
...perty - this allows additional functionality (like validation) to be added more easily later.
Hiding the internal representation of the property while exposing a property using an alternative representation.
Insulating your public interface from change - allowing the public interface to remain const...
Getting a random value from a JavaScript array
...the array
_.sample(['January', 'February', 'March']);
If you need to get more than one item randomly, you can pass that as a second argument in underscore:
// will return two items randomly from the array using underscore
_.sample(['January', 'February', 'March'], 2);
or use the _.sampleSize me...
Pimpl idiom vs Pure virtual class interface
...s at all. When it does make sense, a polymorphic "Clone" method is usually more appropriate. Examples: A Socket class, a Database class, a "policy" class, anything that would be a "closure" in a functional language.
Both pImpl and pure abstract base class are techniques to reduce compile time dep...